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mm: fix exec activate_mm vs TLB shootdown and lazy tlb switching race
[linux/fpc-iii.git] / arch / arm / mach-ep93xx / core.c
blobf53c6181399868ad232f3dcea8173349d6e76a93
1 /*
2 * arch/arm/mach-ep93xx/core.c
3 * Core routines for Cirrus EP93xx chips.
4 *
5 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
6 * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org>
7 *
8 * Thanks go to Michael Burian and Ray Lehtiniemi for their key
9 * role in the ep93xx linux community.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 */
16
17 #define pr_fmt(fmt) "ep93xx " KBUILD_MODNAME ": " fmt
18
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
22 #include <linux/interrupt.h>
23 #include <linux/dma-mapping.h>
24 #include <linux/sys_soc.h>
25 #include <linux/irq.h>
26 #include <linux/io.h>
27 #include <linux/gpio.h>
28 #include <linux/leds.h>
29 #include <linux/termios.h>
30 #include <linux/amba/bus.h>
31 #include <linux/amba/serial.h>
32 #include <linux/mtd/physmap.h>
33 #include <linux/i2c.h>
34 #include <linux/i2c-gpio.h>
35 #include <linux/spi/spi.h>
36 #include <linux/export.h>
37 #include <linux/irqchip/arm-vic.h>
38 #include <linux/reboot.h>
39 #include <linux/usb/ohci_pdriver.h>
40 #include <linux/random.h>
41
42 #include <mach/hardware.h>
43 #include <linux/platform_data/video-ep93xx.h>
44 #include <linux/platform_data/keypad-ep93xx.h>
45 #include <linux/platform_data/spi-ep93xx.h>
46 #include <mach/gpio-ep93xx.h>
47
48 #include <asm/mach/arch.h>
49 #include <asm/mach/map.h>
50
51 #include "soc.h"
52
53 /*************************************************************************
54 * Static I/O mappings that are needed for all EP93xx platforms
55 *************************************************************************/
56 static struct map_desc ep93xx_io_desc[] __initdata = {
57 {
58 .virtual = EP93XX_AHB_VIRT_BASE,
59 .pfn = __phys_to_pfn(EP93XX_AHB_PHYS_BASE),
60 .length = EP93XX_AHB_SIZE,
61 .type = MT_DEVICE,
62 }, {
63 .virtual = EP93XX_APB_VIRT_BASE,
64 .pfn = __phys_to_pfn(EP93XX_APB_PHYS_BASE),
65 .length = EP93XX_APB_SIZE,
66 .type = MT_DEVICE,
67 },
68 };
69
70 void __init ep93xx_map_io(void)
71 {
72 iotable_init(ep93xx_io_desc, ARRAY_SIZE(ep93xx_io_desc));
73 }
74
75 /*************************************************************************
76 * EP93xx IRQ handling
77 *************************************************************************/
78 void __init ep93xx_init_irq(void)
79 {
80 vic_init(EP93XX_VIC1_BASE, 0, EP93XX_VIC1_VALID_IRQ_MASK, 0);
81 vic_init(EP93XX_VIC2_BASE, 32, EP93XX_VIC2_VALID_IRQ_MASK, 0);
82 }
83
84
85 /*************************************************************************
86 * EP93xx System Controller Software Locked register handling
87 *************************************************************************/
88
89 /*
90 * syscon_swlock prevents anything else from writing to the syscon
91 * block while a software locked register is being written.
92 */
93 static DEFINE_SPINLOCK(syscon_swlock);
94
95 void ep93xx_syscon_swlocked_write(unsigned int val, void __iomem *reg)
96 {
97 unsigned long flags;
98
99 spin_lock_irqsave(&syscon_swlock, flags);
100
101 __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
102 __raw_writel(val, reg);
103
104 spin_unlock_irqrestore(&syscon_swlock, flags);
105 }
106
107 void ep93xx_devcfg_set_clear(unsigned int set_bits, unsigned int clear_bits)
108 {
109 unsigned long flags;
110 unsigned int val;
111
112 spin_lock_irqsave(&syscon_swlock, flags);
113
114 val = __raw_readl(EP93XX_SYSCON_DEVCFG);
115 val &= ~clear_bits;
116 val |= set_bits;
117 __raw_writel(0xaa, EP93XX_SYSCON_SWLOCK);
118 __raw_writel(val, EP93XX_SYSCON_DEVCFG);
119
120 spin_unlock_irqrestore(&syscon_swlock, flags);
121 }
122
123 /**
124 * ep93xx_chip_revision() - returns the EP93xx chip revision
125 *
126 * See <mach/platform.h> for more information.
127 */
128 unsigned int ep93xx_chip_revision(void)
129 {
130 unsigned int v;
131
132 v = __raw_readl(EP93XX_SYSCON_SYSCFG);
133 v &= EP93XX_SYSCON_SYSCFG_REV_MASK;
134 v >>= EP93XX_SYSCON_SYSCFG_REV_SHIFT;
135 return v;
136 }
137 EXPORT_SYMBOL_GPL(ep93xx_chip_revision);
138
139 /*************************************************************************
140 * EP93xx GPIO
141 *************************************************************************/
142 static struct resource ep93xx_gpio_resource[] = {
143 DEFINE_RES_MEM(EP93XX_GPIO_PHYS_BASE, 0xcc),
144 };
145
146 static struct platform_device ep93xx_gpio_device = {
147 .name = "gpio-ep93xx",
148 .id = -1,
149 .num_resources = ARRAY_SIZE(ep93xx_gpio_resource),
150 .resource = ep93xx_gpio_resource,
151 };
152
153 /*************************************************************************
154 * EP93xx peripheral handling
155 *************************************************************************/
156 #define EP93XX_UART_MCR_OFFSET (0x0100)
157
158 static void ep93xx_uart_set_mctrl(struct amba_device *dev,
159 void __iomem *base, unsigned int mctrl)
160 {
161 unsigned int mcr;
162
163 mcr = 0;
164 if (mctrl & TIOCM_RTS)
165 mcr |= 2;
166 if (mctrl & TIOCM_DTR)
167 mcr |= 1;
168
169 __raw_writel(mcr, base + EP93XX_UART_MCR_OFFSET);
170 }
171
172 static struct amba_pl010_data ep93xx_uart_data = {
173 .set_mctrl = ep93xx_uart_set_mctrl,
174 };
175
176 static AMBA_APB_DEVICE(uart1, "apb:uart1", 0x00041010, EP93XX_UART1_PHYS_BASE,
177 { IRQ_EP93XX_UART1 }, &ep93xx_uart_data);
178
179 static AMBA_APB_DEVICE(uart2, "apb:uart2", 0x00041010, EP93XX_UART2_PHYS_BASE,
180 { IRQ_EP93XX_UART2 }, NULL);
181
182 static AMBA_APB_DEVICE(uart3, "apb:uart3", 0x00041010, EP93XX_UART3_PHYS_BASE,
183 { IRQ_EP93XX_UART3 }, &ep93xx_uart_data);
184
185 static struct resource ep93xx_rtc_resource[] = {
186 DEFINE_RES_MEM(EP93XX_RTC_PHYS_BASE, 0x10c),
187 };
188
189 static struct platform_device ep93xx_rtc_device = {
190 .name = "ep93xx-rtc",
191 .id = -1,
192 .num_resources = ARRAY_SIZE(ep93xx_rtc_resource),
193 .resource = ep93xx_rtc_resource,
194 };
195
196 /*************************************************************************
197 * EP93xx OHCI USB Host
198 *************************************************************************/
199
200 static struct clk *ep93xx_ohci_host_clock;
201
202 static int ep93xx_ohci_power_on(struct platform_device *pdev)
203 {
204 if (!ep93xx_ohci_host_clock) {
205 ep93xx_ohci_host_clock = devm_clk_get(&pdev->dev, NULL);
206 if (IS_ERR(ep93xx_ohci_host_clock))
207 return PTR_ERR(ep93xx_ohci_host_clock);
208 }
209
210 return clk_enable(ep93xx_ohci_host_clock);
211 }
212
213 static void ep93xx_ohci_power_off(struct platform_device *pdev)
214 {
215 clk_disable(ep93xx_ohci_host_clock);
216 }
217
218 static struct usb_ohci_pdata ep93xx_ohci_pdata = {
219 .power_on = ep93xx_ohci_power_on,
220 .power_off = ep93xx_ohci_power_off,
221 .power_suspend = ep93xx_ohci_power_off,
222 };
223
224 static struct resource ep93xx_ohci_resources[] = {
225 DEFINE_RES_MEM(EP93XX_USB_PHYS_BASE, 0x1000),
226 DEFINE_RES_IRQ(IRQ_EP93XX_USB),
227 };
228
229 static u64 ep93xx_ohci_dma_mask = DMA_BIT_MASK(32);
230
231 static struct platform_device ep93xx_ohci_device = {
232 .name = "ohci-platform",
233 .id = -1,
234 .num_resources = ARRAY_SIZE(ep93xx_ohci_resources),
235 .resource = ep93xx_ohci_resources,
236 .dev = {
237 .dma_mask = &ep93xx_ohci_dma_mask,
238 .coherent_dma_mask = DMA_BIT_MASK(32),
239 .platform_data = &ep93xx_ohci_pdata,
240 },
241 };
242
243 /*************************************************************************
244 * EP93xx physmap'ed flash
245 *************************************************************************/
246 static struct physmap_flash_data ep93xx_flash_data;
247
248 static struct resource ep93xx_flash_resource = {
249 .flags = IORESOURCE_MEM,
250 };
251
252 static struct platform_device ep93xx_flash = {
253 .name = "physmap-flash",
254 .id = 0,
255 .dev = {
256 .platform_data = &ep93xx_flash_data,
257 },
258 .num_resources = 1,
259 .resource = &ep93xx_flash_resource,
260 };
261
262 /**
263 * ep93xx_register_flash() - Register the external flash device.
264 * @width: bank width in octets
265 * @start: resource start address
266 * @size: resource size
267 */
268 void __init ep93xx_register_flash(unsigned int width,
269 resource_size_t start, resource_size_t size)
270 {
271 ep93xx_flash_data.width = width;
272
273 ep93xx_flash_resource.start = start;
274 ep93xx_flash_resource.end = start + size - 1;
275
276 platform_device_register(&ep93xx_flash);
277 }
278
279
280 /*************************************************************************
281 * EP93xx ethernet peripheral handling
282 *************************************************************************/
283 static struct ep93xx_eth_data ep93xx_eth_data;
284
285 static struct resource ep93xx_eth_resource[] = {
286 DEFINE_RES_MEM(EP93XX_ETHERNET_PHYS_BASE, 0x10000),
287 DEFINE_RES_IRQ(IRQ_EP93XX_ETHERNET),
288 };
289
290 static u64 ep93xx_eth_dma_mask = DMA_BIT_MASK(32);
291
292 static struct platform_device ep93xx_eth_device = {
293 .name = "ep93xx-eth",
294 .id = -1,
295 .dev = {
296 .platform_data = &ep93xx_eth_data,
297 .coherent_dma_mask = DMA_BIT_MASK(32),
298 .dma_mask = &ep93xx_eth_dma_mask,
299 },
300 .num_resources = ARRAY_SIZE(ep93xx_eth_resource),
301 .resource = ep93xx_eth_resource,
302 };
303
304 /**
305 * ep93xx_register_eth - Register the built-in ethernet platform device.
306 * @data: platform specific ethernet configuration (__initdata)
307 * @copy_addr: flag indicating that the MAC address should be copied
308 * from the IndAd registers (as programmed by the bootloader)
309 */
310 void __init ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr)
311 {
312 if (copy_addr)
313 memcpy_fromio(data->dev_addr, EP93XX_ETHERNET_BASE + 0x50, 6);
314
315 ep93xx_eth_data = *data;
316 platform_device_register(&ep93xx_eth_device);
317 }
318
319
320 /*************************************************************************
321 * EP93xx i2c peripheral handling
322 *************************************************************************/
323 static struct i2c_gpio_platform_data ep93xx_i2c_data;
324
325 static struct platform_device ep93xx_i2c_device = {
326 .name = "i2c-gpio",
327 .id = 0,
328 .dev = {
329 .platform_data = &ep93xx_i2c_data,
330 },
331 };
332
333 /**
334 * ep93xx_register_i2c - Register the i2c platform device.
335 * @data: platform specific i2c-gpio configuration (__initdata)
336 * @devices: platform specific i2c bus device information (__initdata)
337 * @num: the number of devices on the i2c bus
338 */
339 void __init ep93xx_register_i2c(struct i2c_gpio_platform_data *data,
340 struct i2c_board_info *devices, int num)
341 {
342 /*
343 * Set the EEPROM interface pin drive type control.
344 * Defines the driver type for the EECLK and EEDAT pins as either
345 * open drain, which will require an external pull-up, or a normal
346 * CMOS driver.
347 */
348 if (data->sda_is_open_drain && data->sda_pin != EP93XX_GPIO_LINE_EEDAT)
349 pr_warning("sda != EEDAT, open drain has no effect\n");
350 if (data->scl_is_open_drain && data->scl_pin != EP93XX_GPIO_LINE_EECLK)
351 pr_warning("scl != EECLK, open drain has no effect\n");
352
353 __raw_writel((data->sda_is_open_drain << 1) |
354 (data->scl_is_open_drain << 0),
355 EP93XX_GPIO_EEDRIVE);
356
357 ep93xx_i2c_data = *data;
358 i2c_register_board_info(0, devices, num);
359 platform_device_register(&ep93xx_i2c_device);
360 }
361
362 /*************************************************************************
363 * EP93xx SPI peripheral handling
364 *************************************************************************/
365 static struct ep93xx_spi_info ep93xx_spi_master_data;
366
367 static struct resource ep93xx_spi_resources[] = {
368 DEFINE_RES_MEM(EP93XX_SPI_PHYS_BASE, 0x18),
369 DEFINE_RES_IRQ(IRQ_EP93XX_SSP),
370 };
371
372 static u64 ep93xx_spi_dma_mask = DMA_BIT_MASK(32);
373
374 static struct platform_device ep93xx_spi_device = {
375 .name = "ep93xx-spi",
376 .id = 0,
377 .dev = {
378 .platform_data = &ep93xx_spi_master_data,
379 .coherent_dma_mask = DMA_BIT_MASK(32),
380 .dma_mask = &ep93xx_spi_dma_mask,
381 },
382 .num_resources = ARRAY_SIZE(ep93xx_spi_resources),
383 .resource = ep93xx_spi_resources,
384 };
385
386 /**
387 * ep93xx_register_spi() - registers spi platform device
388 * @info: ep93xx board specific spi master info (__initdata)
389 * @devices: SPI devices to register (__initdata)
390 * @num: number of SPI devices to register
391 *
392 * This function registers platform device for the EP93xx SPI controller and
393 * also makes sure that SPI pins are muxed so that I2S is not using those pins.
394 */
395 void __init ep93xx_register_spi(struct ep93xx_spi_info *info,
396 struct spi_board_info *devices, int num)
397 {
398 /*
399 * When SPI is used, we need to make sure that I2S is muxed off from
400 * SPI pins.
401 */
402 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONSSP);
403
404 ep93xx_spi_master_data = *info;
405 spi_register_board_info(devices, num);
406 platform_device_register(&ep93xx_spi_device);
407 }
408
409 /*************************************************************************
410 * EP93xx LEDs
411 *************************************************************************/
412 static const struct gpio_led ep93xx_led_pins[] __initconst = {
413 {
414 .name = "platform:grled",
415 .gpio = EP93XX_GPIO_LINE_GRLED,
416 }, {
417 .name = "platform:rdled",
418 .gpio = EP93XX_GPIO_LINE_RDLED,
419 },
420 };
421
422 static const struct gpio_led_platform_data ep93xx_led_data __initconst = {
423 .num_leds = ARRAY_SIZE(ep93xx_led_pins),
424 .leds = ep93xx_led_pins,
425 };
426
427 /*************************************************************************
428 * EP93xx pwm peripheral handling
429 *************************************************************************/
430 static struct resource ep93xx_pwm0_resource[] = {
431 DEFINE_RES_MEM(EP93XX_PWM_PHYS_BASE, 0x10),
432 };
433
434 static struct platform_device ep93xx_pwm0_device = {
435 .name = "ep93xx-pwm",
436 .id = 0,
437 .num_resources = ARRAY_SIZE(ep93xx_pwm0_resource),
438 .resource = ep93xx_pwm0_resource,
439 };
440
441 static struct resource ep93xx_pwm1_resource[] = {
442 DEFINE_RES_MEM(EP93XX_PWM_PHYS_BASE + 0x20, 0x10),
443 };
444
445 static struct platform_device ep93xx_pwm1_device = {
446 .name = "ep93xx-pwm",
447 .id = 1,
448 .num_resources = ARRAY_SIZE(ep93xx_pwm1_resource),
449 .resource = ep93xx_pwm1_resource,
450 };
451
452 void __init ep93xx_register_pwm(int pwm0, int pwm1)
453 {
454 if (pwm0)
455 platform_device_register(&ep93xx_pwm0_device);
456
457 /* NOTE: EP9307 does not have PWMOUT1 (pin EGPIO14) */
458 if (pwm1)
459 platform_device_register(&ep93xx_pwm1_device);
460 }
461
462 int ep93xx_pwm_acquire_gpio(struct platform_device *pdev)
463 {
464 int err;
465
466 if (pdev->id == 0) {
467 err = 0;
468 } else if (pdev->id == 1) {
469 err = gpio_request(EP93XX_GPIO_LINE_EGPIO14,
470 dev_name(&pdev->dev));
471 if (err)
472 return err;
473 err = gpio_direction_output(EP93XX_GPIO_LINE_EGPIO14, 0);
474 if (err)
475 goto fail;
476
477 /* PWM 1 output on EGPIO[14] */
478 ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_PONG);
479 } else {
480 err = -ENODEV;
481 }
482
483 return err;
484
485 fail:
486 gpio_free(EP93XX_GPIO_LINE_EGPIO14);
487 return err;
488 }
489 EXPORT_SYMBOL(ep93xx_pwm_acquire_gpio);
490
491 void ep93xx_pwm_release_gpio(struct platform_device *pdev)
492 {
493 if (pdev->id == 1) {
494 gpio_direction_input(EP93XX_GPIO_LINE_EGPIO14);
495 gpio_free(EP93XX_GPIO_LINE_EGPIO14);
496
497 /* EGPIO[14] used for GPIO */
498 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_PONG);
499 }
500 }
501 EXPORT_SYMBOL(ep93xx_pwm_release_gpio);
502
503
504 /*************************************************************************
505 * EP93xx video peripheral handling
506 *************************************************************************/
507 static struct ep93xxfb_mach_info ep93xxfb_data;
508
509 static struct resource ep93xx_fb_resource[] = {
510 DEFINE_RES_MEM(EP93XX_RASTER_PHYS_BASE, 0x800),
511 };
512
513 static struct platform_device ep93xx_fb_device = {
514 .name = "ep93xx-fb",
515 .id = -1,
516 .dev = {
517 .platform_data = &ep93xxfb_data,
518 .coherent_dma_mask = DMA_BIT_MASK(32),
519 .dma_mask = &ep93xx_fb_device.dev.coherent_dma_mask,
520 },
521 .num_resources = ARRAY_SIZE(ep93xx_fb_resource),
522 .resource = ep93xx_fb_resource,
523 };
524
525 /* The backlight use a single register in the framebuffer's register space */
526 #define EP93XX_RASTER_REG_BRIGHTNESS 0x20
527
528 static struct resource ep93xx_bl_resources[] = {
529 DEFINE_RES_MEM(EP93XX_RASTER_PHYS_BASE +
530 EP93XX_RASTER_REG_BRIGHTNESS, 0x04),
531 };
532
533 static struct platform_device ep93xx_bl_device = {
534 .name = "ep93xx-bl",
535 .id = -1,
536 .num_resources = ARRAY_SIZE(ep93xx_bl_resources),
537 .resource = ep93xx_bl_resources,
538 };
539
540 /**
541 * ep93xx_register_fb - Register the framebuffer platform device.
542 * @data: platform specific framebuffer configuration (__initdata)
543 */
544 void __init ep93xx_register_fb(struct ep93xxfb_mach_info *data)
545 {
546 ep93xxfb_data = *data;
547 platform_device_register(&ep93xx_fb_device);
548 platform_device_register(&ep93xx_bl_device);
549 }
550
551
552 /*************************************************************************
553 * EP93xx matrix keypad peripheral handling
554 *************************************************************************/
555 static struct ep93xx_keypad_platform_data ep93xx_keypad_data;
556
557 static struct resource ep93xx_keypad_resource[] = {
558 DEFINE_RES_MEM(EP93XX_KEY_MATRIX_PHYS_BASE, 0x0c),
559 DEFINE_RES_IRQ(IRQ_EP93XX_KEY),
560 };
561
562 static struct platform_device ep93xx_keypad_device = {
563 .name = "ep93xx-keypad",
564 .id = -1,
565 .dev = {
566 .platform_data = &ep93xx_keypad_data,
567 },
568 .num_resources = ARRAY_SIZE(ep93xx_keypad_resource),
569 .resource = ep93xx_keypad_resource,
570 };
571
572 /**
573 * ep93xx_register_keypad - Register the keypad platform device.
574 * @data: platform specific keypad configuration (__initdata)
575 */
576 void __init ep93xx_register_keypad(struct ep93xx_keypad_platform_data *data)
577 {
578 ep93xx_keypad_data = *data;
579 platform_device_register(&ep93xx_keypad_device);
580 }
581
582 int ep93xx_keypad_acquire_gpio(struct platform_device *pdev)
583 {
584 int err;
585 int i;
586
587 for (i = 0; i < 8; i++) {
588 err = gpio_request(EP93XX_GPIO_LINE_C(i), dev_name(&pdev->dev));
589 if (err)
590 goto fail_gpio_c;
591 err = gpio_request(EP93XX_GPIO_LINE_D(i), dev_name(&pdev->dev));
592 if (err)
593 goto fail_gpio_d;
594 }
595
596 /* Enable the keypad controller; GPIO ports C and D used for keypad */
597 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_KEYS |
598 EP93XX_SYSCON_DEVCFG_GONK);
599
600 return 0;
601
602 fail_gpio_d:
603 gpio_free(EP93XX_GPIO_LINE_C(i));
604 fail_gpio_c:
605 for (--i; i >= 0; --i) {
606 gpio_free(EP93XX_GPIO_LINE_C(i));
607 gpio_free(EP93XX_GPIO_LINE_D(i));
608 }
609 return err;
610 }
611 EXPORT_SYMBOL(ep93xx_keypad_acquire_gpio);
612
613 void ep93xx_keypad_release_gpio(struct platform_device *pdev)
614 {
615 int i;
616
617 for (i = 0; i < 8; i++) {
618 gpio_free(EP93XX_GPIO_LINE_C(i));
619 gpio_free(EP93XX_GPIO_LINE_D(i));
620 }
621
622 /* Disable the keypad controller; GPIO ports C and D used for GPIO */
623 ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
624 EP93XX_SYSCON_DEVCFG_GONK);
625 }
626 EXPORT_SYMBOL(ep93xx_keypad_release_gpio);
627
628 /*************************************************************************
629 * EP93xx I2S audio peripheral handling
630 *************************************************************************/
631 static struct resource ep93xx_i2s_resource[] = {
632 DEFINE_RES_MEM(EP93XX_I2S_PHYS_BASE, 0x100),
633 };
634
635 static struct platform_device ep93xx_i2s_device = {
636 .name = "ep93xx-i2s",
637 .id = -1,
638 .num_resources = ARRAY_SIZE(ep93xx_i2s_resource),
639 .resource = ep93xx_i2s_resource,
640 };
641
642 static struct platform_device ep93xx_pcm_device = {
643 .name = "ep93xx-pcm-audio",
644 .id = -1,
645 };
646
647 void __init ep93xx_register_i2s(void)
648 {
649 platform_device_register(&ep93xx_i2s_device);
650 platform_device_register(&ep93xx_pcm_device);
651 }
652
653 #define EP93XX_SYSCON_DEVCFG_I2S_MASK (EP93XX_SYSCON_DEVCFG_I2SONSSP | \
654 EP93XX_SYSCON_DEVCFG_I2SONAC97)
655
656 #define EP93XX_I2SCLKDIV_MASK (EP93XX_SYSCON_I2SCLKDIV_ORIDE | \
657 EP93XX_SYSCON_I2SCLKDIV_SPOL)
658
659 int ep93xx_i2s_acquire(void)
660 {
661 unsigned val;
662
663 ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_I2SONAC97,
664 EP93XX_SYSCON_DEVCFG_I2S_MASK);
665
666 /*
667 * This is potentially racy with the clock api for i2s_mclk, sclk and
668 * lrclk. Since the i2s driver is the only user of those clocks we
669 * rely on it to prevent parallel use of this function and the
670 * clock api for the i2s clocks.
671 */
672 val = __raw_readl(EP93XX_SYSCON_I2SCLKDIV);
673 val &= ~EP93XX_I2SCLKDIV_MASK;
674 val |= EP93XX_SYSCON_I2SCLKDIV_ORIDE | EP93XX_SYSCON_I2SCLKDIV_SPOL;
675 ep93xx_syscon_swlocked_write(val, EP93XX_SYSCON_I2SCLKDIV);
676
677 return 0;
678 }
679 EXPORT_SYMBOL(ep93xx_i2s_acquire);
680
681 void ep93xx_i2s_release(void)
682 {
683 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2S_MASK);
684 }
685 EXPORT_SYMBOL(ep93xx_i2s_release);
686
687 /*************************************************************************
688 * EP93xx AC97 audio peripheral handling
689 *************************************************************************/
690 static struct resource ep93xx_ac97_resources[] = {
691 DEFINE_RES_MEM(EP93XX_AAC_PHYS_BASE, 0xac),
692 DEFINE_RES_IRQ(IRQ_EP93XX_AACINTR),
693 };
694
695 static struct platform_device ep93xx_ac97_device = {
696 .name = "ep93xx-ac97",
697 .id = -1,
698 .num_resources = ARRAY_SIZE(ep93xx_ac97_resources),
699 .resource = ep93xx_ac97_resources,
700 };
701
702 void __init ep93xx_register_ac97(void)
703 {
704 /*
705 * Make sure that the AC97 pins are not used by I2S.
706 */
707 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_I2SONAC97);
708
709 platform_device_register(&ep93xx_ac97_device);
710 platform_device_register(&ep93xx_pcm_device);
711 }
712
713 /*************************************************************************
714 * EP93xx Watchdog
715 *************************************************************************/
716 static struct resource ep93xx_wdt_resources[] = {
717 DEFINE_RES_MEM(EP93XX_WATCHDOG_PHYS_BASE, 0x08),
718 };
719
720 static struct platform_device ep93xx_wdt_device = {
721 .name = "ep93xx-wdt",
722 .id = -1,
723 .num_resources = ARRAY_SIZE(ep93xx_wdt_resources),
724 .resource = ep93xx_wdt_resources,
725 };
726
727 /*************************************************************************
728 * EP93xx IDE
729 *************************************************************************/
730 static struct resource ep93xx_ide_resources[] = {
731 DEFINE_RES_MEM(EP93XX_IDE_PHYS_BASE, 0x38),
732 DEFINE_RES_IRQ(IRQ_EP93XX_EXT3),
733 };
734
735 static struct platform_device ep93xx_ide_device = {
736 .name = "ep93xx-ide",
737 .id = -1,
738 .dev = {
739 .dma_mask = &ep93xx_ide_device.dev.coherent_dma_mask,
740 .coherent_dma_mask = DMA_BIT_MASK(32),
741 },
742 .num_resources = ARRAY_SIZE(ep93xx_ide_resources),
743 .resource = ep93xx_ide_resources,
744 };
745
746 void __init ep93xx_register_ide(void)
747 {
748 platform_device_register(&ep93xx_ide_device);
749 }
750
751 int ep93xx_ide_acquire_gpio(struct platform_device *pdev)
752 {
753 int err;
754 int i;
755
756 err = gpio_request(EP93XX_GPIO_LINE_EGPIO2, dev_name(&pdev->dev));
757 if (err)
758 return err;
759 err = gpio_request(EP93XX_GPIO_LINE_EGPIO15, dev_name(&pdev->dev));
760 if (err)
761 goto fail_egpio15;
762 for (i = 2; i < 8; i++) {
763 err = gpio_request(EP93XX_GPIO_LINE_E(i), dev_name(&pdev->dev));
764 if (err)
765 goto fail_gpio_e;
766 }
767 for (i = 4; i < 8; i++) {
768 err = gpio_request(EP93XX_GPIO_LINE_G(i), dev_name(&pdev->dev));
769 if (err)
770 goto fail_gpio_g;
771 }
772 for (i = 0; i < 8; i++) {
773 err = gpio_request(EP93XX_GPIO_LINE_H(i), dev_name(&pdev->dev));
774 if (err)
775 goto fail_gpio_h;
776 }
777
778 /* GPIO ports E[7:2], G[7:4] and H used by IDE */
779 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_EONIDE |
780 EP93XX_SYSCON_DEVCFG_GONIDE |
781 EP93XX_SYSCON_DEVCFG_HONIDE);
782 return 0;
783
784 fail_gpio_h:
785 for (--i; i >= 0; --i)
786 gpio_free(EP93XX_GPIO_LINE_H(i));
787 i = 8;
788 fail_gpio_g:
789 for (--i; i >= 4; --i)
790 gpio_free(EP93XX_GPIO_LINE_G(i));
791 i = 8;
792 fail_gpio_e:
793 for (--i; i >= 2; --i)
794 gpio_free(EP93XX_GPIO_LINE_E(i));
795 gpio_free(EP93XX_GPIO_LINE_EGPIO15);
796 fail_egpio15:
797 gpio_free(EP93XX_GPIO_LINE_EGPIO2);
798 return err;
799 }
800 EXPORT_SYMBOL(ep93xx_ide_acquire_gpio);
801
802 void ep93xx_ide_release_gpio(struct platform_device *pdev)
803 {
804 int i;
805
806 for (i = 2; i < 8; i++)
807 gpio_free(EP93XX_GPIO_LINE_E(i));
808 for (i = 4; i < 8; i++)
809 gpio_free(EP93XX_GPIO_LINE_G(i));
810 for (i = 0; i < 8; i++)
811 gpio_free(EP93XX_GPIO_LINE_H(i));
812 gpio_free(EP93XX_GPIO_LINE_EGPIO15);
813 gpio_free(EP93XX_GPIO_LINE_EGPIO2);
814
815
816 /* GPIO ports E[7:2], G[7:4] and H used by GPIO */
817 ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_EONIDE |
818 EP93XX_SYSCON_DEVCFG_GONIDE |
819 EP93XX_SYSCON_DEVCFG_HONIDE);
820 }
821 EXPORT_SYMBOL(ep93xx_ide_release_gpio);
822
823 /*************************************************************************
824 * EP93xx ADC
825 *************************************************************************/
826 static struct resource ep93xx_adc_resources[] = {
827 DEFINE_RES_MEM(EP93XX_ADC_PHYS_BASE, 0x28),
828 DEFINE_RES_IRQ(IRQ_EP93XX_TOUCH),
829 };
830
831 static struct platform_device ep93xx_adc_device = {
832 .name = "ep93xx-adc",
833 .id = -1,
834 .num_resources = ARRAY_SIZE(ep93xx_adc_resources),
835 .resource = ep93xx_adc_resources,
836 };
837
838 void __init ep93xx_register_adc(void)
839 {
840 /* Power up ADC, deactivate Touch Screen Controller */
841 ep93xx_devcfg_set_clear(EP93XX_SYSCON_DEVCFG_TIN,
842 EP93XX_SYSCON_DEVCFG_ADCPD);
843
844 platform_device_register(&ep93xx_adc_device);
845 }
846
847 /*************************************************************************
848 * EP93xx Security peripheral
849 *************************************************************************/
850
851 /*
852 * The Maverick Key is 256 bits of micro fuses blown at the factory during
853 * manufacturing to uniquely identify a part.
854 *
855 * See: http://arm.cirrus.com/forum/viewtopic.php?t=486&highlight=maverick+key
856 */
857 #define EP93XX_SECURITY_REG(x) (EP93XX_SECURITY_BASE + (x))
858 #define EP93XX_SECURITY_SECFLG EP93XX_SECURITY_REG(0x2400)
859 #define EP93XX_SECURITY_FUSEFLG EP93XX_SECURITY_REG(0x2410)
860 #define EP93XX_SECURITY_UNIQID EP93XX_SECURITY_REG(0x2440)
861 #define EP93XX_SECURITY_UNIQCHK EP93XX_SECURITY_REG(0x2450)
862 #define EP93XX_SECURITY_UNIQVAL EP93XX_SECURITY_REG(0x2460)
863 #define EP93XX_SECURITY_SECID1 EP93XX_SECURITY_REG(0x2500)
864 #define EP93XX_SECURITY_SECID2 EP93XX_SECURITY_REG(0x2504)
865 #define EP93XX_SECURITY_SECCHK1 EP93XX_SECURITY_REG(0x2520)
866 #define EP93XX_SECURITY_SECCHK2 EP93XX_SECURITY_REG(0x2524)
867 #define EP93XX_SECURITY_UNIQID2 EP93XX_SECURITY_REG(0x2700)
868 #define EP93XX_SECURITY_UNIQID3 EP93XX_SECURITY_REG(0x2704)
869 #define EP93XX_SECURITY_UNIQID4 EP93XX_SECURITY_REG(0x2708)
870 #define EP93XX_SECURITY_UNIQID5 EP93XX_SECURITY_REG(0x270c)
871
872 static char ep93xx_soc_id[33];
873
874 static const char __init *ep93xx_get_soc_id(void)
875 {
876 unsigned int id, id2, id3, id4, id5;
877
878 if (__raw_readl(EP93XX_SECURITY_UNIQVAL) != 1)
879 return "bad Hamming code";
880
881 id = __raw_readl(EP93XX_SECURITY_UNIQID);
882 id2 = __raw_readl(EP93XX_SECURITY_UNIQID2);
883 id3 = __raw_readl(EP93XX_SECURITY_UNIQID3);
884 id4 = __raw_readl(EP93XX_SECURITY_UNIQID4);
885 id5 = __raw_readl(EP93XX_SECURITY_UNIQID5);
886
887 if (id != id2)
888 return "invalid";
889
890 /* Toss the unique ID into the entropy pool */
891 add_device_randomness(&id2, 4);
892 add_device_randomness(&id3, 4);
893 add_device_randomness(&id4, 4);
894 add_device_randomness(&id5, 4);
895
896 snprintf(ep93xx_soc_id, sizeof(ep93xx_soc_id),
897 "%08x%08x%08x%08x", id2, id3, id4, id5);
898
899 return ep93xx_soc_id;
900 }
901
902 static const char __init *ep93xx_get_soc_rev(void)
903 {
904 int rev = ep93xx_chip_revision();
905
906 switch (rev) {
907 case EP93XX_CHIP_REV_D0:
908 return "D0";
909 case EP93XX_CHIP_REV_D1:
910 return "D1";
911 case EP93XX_CHIP_REV_E0:
912 return "E0";
913 case EP93XX_CHIP_REV_E1:
914 return "E1";
915 case EP93XX_CHIP_REV_E2:
916 return "E2";
917 default:
918 return "unknown";
919 }
920 }
921
922 static const char __init *ep93xx_get_machine_name(void)
923 {
924 return kasprintf(GFP_KERNEL,"%s", machine_desc->name);
925 }
926
927 static struct device __init *ep93xx_init_soc(void)
928 {
929 struct soc_device_attribute *soc_dev_attr;
930 struct soc_device *soc_dev;
931
932 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
933 if (!soc_dev_attr)
934 return NULL;
935
936 soc_dev_attr->machine = ep93xx_get_machine_name();
937 soc_dev_attr->family = "Cirrus Logic EP93xx";
938 soc_dev_attr->revision = ep93xx_get_soc_rev();
939 soc_dev_attr->soc_id = ep93xx_get_soc_id();
940
941 soc_dev = soc_device_register(soc_dev_attr);
942 if (IS_ERR(soc_dev)) {
943 kfree(soc_dev_attr->machine);
944 kfree(soc_dev_attr);
945 return NULL;
946 }
947
948 return soc_device_to_device(soc_dev);
949 }
950
951 struct device __init *ep93xx_init_devices(void)
952 {
953 struct device *parent;
954
955 /* Disallow access to MaverickCrunch initially */
956 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_CPENA);
957
958 /* Default all ports to GPIO */
959 ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
960 EP93XX_SYSCON_DEVCFG_GONK |
961 EP93XX_SYSCON_DEVCFG_EONIDE |
962 EP93XX_SYSCON_DEVCFG_GONIDE |
963 EP93XX_SYSCON_DEVCFG_HONIDE);
964
965 parent = ep93xx_init_soc();
966
967 /* Get the GPIO working early, other devices need it */
968 platform_device_register(&ep93xx_gpio_device);
969
970 amba_device_register(&uart1_device, &iomem_resource);
971 amba_device_register(&uart2_device, &iomem_resource);
972 amba_device_register(&uart3_device, &iomem_resource);
973
974 platform_device_register(&ep93xx_rtc_device);
975 platform_device_register(&ep93xx_ohci_device);
976 platform_device_register(&ep93xx_wdt_device);
977
978 gpio_led_register_device(-1, &ep93xx_led_data);
979
980 return parent;
981 }
982
983 void ep93xx_restart(enum reboot_mode mode, const char *cmd)
984 {
985 /*
986 * Set then clear the SWRST bit to initiate a software reset
987 */
988 ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_SWRST);
989 ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_SWRST);
990
991 while (1)
992 ;
993 }
994
995 void __init ep93xx_init_late(void)
996 {
997 crunch_init();
998 }
Linux with added FPC-III support